On the Expressivity of ASK Queries in SPARQL

被引:0
|
作者
Zhang, Xiaowang [1 ,4 ]
Van den Bussche, Jan [2 ]
Wang, Kewen [3 ]
Zhang, Heng [1 ]
Yang, Xuanxing [1 ,4 ]
Feng, Zhiyong [1 ]
机构
[1] Tianjin Univ, Coll Intelligence & Comp, Tianjin, Peoples R China
[2] Hasselt Univ, Fac Sci, Hasselt, Belgium
[3] Griffith Univ, Sch Informat & Commun Technol, Brisbane, Qld, Australia
[4] Tianjin Key Lab Cognit Comp & Applicat, Tianjin, Peoples R China
基金
中国国家自然科学基金;
关键词
D O I
暂无
中图分类号
TP18 [人工智能理论];
学科分类号
081104 ; 0812 ; 0835 ; 1405 ;
摘要
As a major query type in SPARQL, ASK queries are boolean queries and have found applications in several domains such as semantic SPARQL optimization. This paper is a first systematic study of the relative expressive power of various fragments of ASK queries in SPARQL. Among many new results, a surprising one is that the operator UNION is redundant for ASK queries. The results in this paper as a whole paint a rich picture for the expressivity of fragments of ASK queries with the four basic operators of SPARQL 1.0 possibly together with a negation. The work in this paper provides a guideline for future SPARQL query optimization and implementation.
引用
收藏
页码:3057 / 3064
页数:8
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